Add 'Reduced CPU Usage' menu option and config entry.

src/AppConfig.cpp

@@ -199,6 +199,7 @@ AppConfig::AppConfig() : configName("") {
     winH.store(0);
     winMax.store(false);
     showTips.store(true);
+    lowPerfMode.store(false);
     themeId.store(0);
     snap.store(1);
     centerFreq.store(100000000);
@@ -265,6 +266,14 @@ bool AppConfig::getShowTips() {
     return showTips.load();
 }
 
+void AppConfig::setLowPerfMode(bool show) {
+    lowPerfMode.store(show);
+}
+
+bool AppConfig::getLowPerfMode() {
+    return lowPerfMode.load();
+}
+
 wxRect *AppConfig::getWindow() {
     wxRect *r = NULL;
     if (winH.load() && winW.load()) {
@@ -360,6 +369,7 @@ bool AppConfig::save() {
 
         *window_node->newChild("max") = winMax.load();
         *window_node->newChild("tips") = showTips.load();
+        *window_node->newChild("low_perf_mode") = lowPerfMode.load();
         *window_node->newChild("theme") = themeId.load();
         *window_node->newChild("snap") = snap.load();
         *window_node->newChild("center_freq") = centerFreq.load();
@@ -444,7 +454,7 @@ bool AppConfig::load() {
 
     if (cfg.rootNode()->hasAnother("window")) {
         int x,y,w,h;
-        int max,tips;
+        int max,tips,lpm;
         
         DataNode *win_node = cfg.rootNode()->getNext("window");
         
@@ -470,6 +480,11 @@ bool AppConfig::load() {
             showTips.store(tips?true:false);
         }
 
+        if (win_node->hasAnother("low_perf_mode")) {
+            win_node->getNext("low_perf_mode")->element()->get(lpm);
+            lowPerfMode.store(lpm?true:false);
+        }
+
         if (win_node->hasAnother("theme")) {
             int theme;
             win_node->getNext("theme")->element()->get(theme);

src/AppConfig.h

@@ -73,6 +73,9 @@ public:
     void setShowTips(bool show);
     bool getShowTips();
 
+    void setLowPerfMode(bool lpm);
+    bool getLowPerfMode();
+    
     void setTheme(int themeId);
     int getTheme();
 
@@ -127,7 +130,7 @@ private:
     std::string configName;
     std::map<std::string, DeviceConfig *> deviceConfig;
     std::atomic_int winX,winY,winW,winH;
-    std::atomic_bool winMax, showTips;
+    std::atomic_bool winMax, showTips, lowPerfMode;
     std::atomic_int themeId;
     std::atomic_llong snap;
     std::atomic_llong centerFreq;

src/AppFrame.cpp

@@ -605,6 +605,14 @@ void AppFrame::updateDeviceParams() {
     showTipMenuItem = newSettingsMenu->AppendCheckItem(wxID_SET_TIPS, "Show Hover Tips");
     showTipMenuItem->Check(wxGetApp().getConfig()->getShowTips());
 
+    lowPerfMode = wxGetApp().getConfig()->getLowPerfMode();
+    lowPerfMenuItem = newSettingsMenu->AppendCheckItem(wxID_LOW_PERF, "Reduce CPU Usage");
+    if (lowPerfMode) {
+        lowPerfMenuItem->Check(true);
+    }
+
+    newSettingsMenu->AppendSeparator();
+
     newSettingsMenu->Append(wxID_SET_FREQ_OFFSET, "Frequency Offset");
 
     if (devInfo->hasCORR(SOAPY_SDR_RX, 0)) {
@@ -627,6 +635,10 @@ void AppFrame::updateDeviceParams() {
     SoapySDR::ArgInfoList::const_iterator args_i;
     settingArgs = soapyDev->getSettingInfo();
 
+    if (settingArgs.size()) {
+        newSettingsMenu->AppendSeparator();
+    }
+    
     for (args_i = settingArgs.begin(); args_i != settingArgs.end(); args_i++) {
         SoapySDR::ArgInfo arg = (*args_i);
         std::string currentVal = soapyDev->readSetting(arg.key);
@@ -781,6 +793,21 @@ void AppFrame::OnMenu(wxCommandEvent& event) {
                 wxGetApp().setDevice(dev);
             }
         }
+    } else if (event.GetId() == wxID_LOW_PERF) {
+        lowPerfMode = lowPerfMenuItem->IsChecked();
+        wxGetApp().getConfig()->setLowPerfMode(lowPerfMode);
+
+//        long srate = wxGetApp().getSampleRate();
+//        if (srate > CHANNELIZER_RATE_MAX && lowPerfMode) {
+//            if (wxGetApp().getSpectrumProcessor()->getFFTSize() != 1024) {
+//                setMainWaterfallFFTSize(1024);
+//            }
+//        } else if (srate > CHANNELIZER_RATE_MAX) {
+//            if (wxGetApp().getSpectrumProcessor()->getFFTSize() != 2048) {
+//                setMainWaterfallFFTSize(2048);
+//            }
+//        }
+
     } else if (event.GetId() == wxID_SET_TIPS ) {
         if (wxGetApp().getConfig()->getShowTips()) {
             wxGetApp().getConfig()->setShowTips(false);
@@ -1462,10 +1489,14 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
 #endif
     
     if (!this->IsActive()) {
-        std::this_thread::sleep_for(std::chrono::milliseconds(25));
+        std::this_thread::sleep_for(std::chrono::milliseconds(30));
+    } else {
+        if (lowPerfMode) {
+            std::this_thread::sleep_for(std::chrono::milliseconds(30));
         } else {
             std::this_thread::sleep_for(std::chrono::milliseconds(1));
         }
+    }
     
     event.RequestMore();
 }

src/AppFrame.h

@@ -31,6 +31,7 @@
 #define wxID_SDR_DEVICES 2008
 #define wxID_AGC_CONTROL 2009
 #define wxID_SDR_START_STOP 2010
+#define wxID_LOW_PERF 2011
 
 #define wxID_MAIN_SPLITTER 2050
 #define wxID_VIS_SPLITTER 2051
@@ -134,6 +135,7 @@ private:
     wxMenu *sampleRateMenu;
     wxMenuItem *agcMenuItem;
     wxMenuItem *iqSwapMenuItem;
+    wxMenuItem *lowPerfMenuItem;
     wxMenu *settingsMenu;
     SoapySDR::ArgInfoList settingArgs;
     int settingsIdMax;
@@ -152,6 +154,8 @@ private:
     ModemArgInfoList newModemArgs;
 	wxMenuItem *showTipMenuItem;
 
+    bool lowPerfMode;
+    
 #ifdef USE_HAMLIB
     void enableRig();
     void disableRig();

src/process/SpectrumVisualProcessor.cpp

@@ -201,6 +201,14 @@ void SpectrumVisualProcessor::setFFTSize(unsigned int fftSize_in) {
     fftSizeChanged.store(true);
 }
 
+unsigned int SpectrumVisualProcessor::getFFTSize() {
+    if (fftSizeChanged.load()) {
+        return newFFTSize;
+    }
+    return fftSize.load();
+}
+
+
 void SpectrumVisualProcessor::setHideDC(bool hideDC) {
     this->hideDC.store(hideDC);
 }

src/process/SpectrumVisualProcessor.h

@@ -47,6 +47,7 @@ public:
     
     void setup(unsigned int fftSize);
     void setFFTSize(unsigned int fftSize);
+    unsigned int getFFTSize();
     void setHideDC(bool hideDC);
     
     void setScaleFactor(float sf);